BUT WHAT ABOUT THE BROTHER AND THE GINGER

there is one. Its called Between the Comet and the Sun. Im assuming its gonna be uploaded after the main couple's side story

https://newtoki348.com/webtoon/39121565?stx=%EB%B3%84%EA%B3%BC+%EB%B3%84+%EC%82%AC%EC%9D%B4&toon=BL%252FGL&title=%EB%B3%84%EA%B3%BC-%EB%B3%84-%EC%82%AC%EC%9D%B4-%ED%98%9C%EC%84%B1%EA%B3%BC-%ED%83%9C%EC%96%91-%EC%82%AC%EC%9D%B4-1%ED%99%94&spage=1